1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>enable_irq</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="hardware.html#idp1125715868" title="Interrupt Handling"><link rel="prev" href="API-disable-hardirq.html" title="disable_hardirq"><link rel="next" href="API-irq-set-irq-wake.html" title="irq_set_irq_wake"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">enable_irq</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-disable-hardirq.html">Prev</a>&#160;</td><th width="60%" align="center">Interrupt Handling</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-irq-set-irq-wake.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-enable-irq"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>enable_irq &#8212; 
2     enable handling of an irq
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <b class="fsfunc">enable_irq </b>(</code></td><td>unsigned int <var class="pdparam">irq</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1125769260"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>irq</code></em></span></dt><dd><p>
4     Interrupt to enable
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1125770860"></a><h2>Description</h2><p>
6   Undoes the effect of one call to <code class="function">disable_irq</code>.  If this
7   matches the last disable, processing of interrupts on this
8   IRQ line is re-enabled.
9   </p><p>
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11   This function may be called from IRQ context only when
12   desc-&gt;irq_data.chip-&gt;bus_lock and desc-&gt;chip-&gt;bus_sync_unlock are NULL !
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